In: Wolfgang Wahlster (Hrsg.). SmartKom: Foundations of Multimodal Dialogue Systems. Pages 29-39, Cognitive Technologies, ISBN 978-3-540-23732-7, Springer, Berlin, Heidelberg, New York, 7/2006.
In: Proceedings of the 29th Annual German Conference on Artificial Intelligence (KI 2006). German Conference on Artificial Intelligence (KI), Pages 37-40, Vol. KI 2006 Demo Presentations, 6/2006.